<template>
  <div class="course">
    <Header></Header>
    <div class="main">
      <!-- 筛选条件 -->
      <div class="condition">
        <ul class="cate-list">
          <li class="title">课程分类:</li>
<!--          <li class="this">全部</li>-->
          <li :class="{this:category===0}" @click="filter_courses(0)">全部</li>
          <li :class="{this:category===category_value.id}" @click="filter_courses(category_value.id)" v-for="(category_value, category_index) in category_list" :key="category_value.id">{{category_value.name}}</li>

        </ul>

<!--        <div class="ordering">-->
<!--          <ul>-->
<!--            <li class="title">筛&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;选: </li>-->
<!--            <li class="default this">默认</li>-->
<!--            <li class="hot this">人气</li>-->
<!--            <li class="price this">价格</li>-->
<!--          </ul>-->
<!--          <p class="condition-result">共21个课程</p>-->
<!--        </div>-->

      </div>
      <!-- 课程列表 -->
      <div style="text-align: center">
        <el-pagination
        background
        @current-change="pageChangeEvent"
        :page-size="5"
        @size-change="handleSizeChange"
        :page-sizes="[2, 5 ,10, 20]"
        layout="sizes, prev, pager, next ,jumper, total"
        :total="count">
      </el-pagination>
      </div>
      <div class="course-list">
        <div class="course-item" v-for="(course_value, course_index) in course_data" :key="course_value.id">
          <div class="course-image">
            <img :src="course_value.course_img" alt="" width="100%" height="210">
          </div>
          <div class="course-info">
            <h3><router-link :to="'/coursedetail/' + course_value.id + '/'">{{course_value.name}}</router-link> <span><img src="/static/image/avatar1.svg" alt="">{{course_value.students}}人已加入学习</span></h3>
            <p class="teather-info">{{course_value.teacher.name}} {{course_value.teacher.signature}} {{course_value.teacher.title}} <span>共{{course_value.lessons}}课时/{{course_value.lessons === course_value.pub_lessons?'更新完成':`已更新${course_value.pub_lessons}课时`}}</span></p>
            <ul class="lesson-list">
              <li v-for="(course_lesson_value,course_lesson_index) in course_value.get_lessons"><span class="lesson-title">0{{course_lesson_index+1}} | 第{{course_lesson_value.lesson}}节：{{course_lesson_value.name}}</span> <span class="free" v-if="course_lesson_value.free_trail">免费</span></li>
<!--              <li><span class="lesson-title">01 | 第1节：初识编码初识编码</span> <span class="free">免费</span></li>-->
<!--              <li><span class="lesson-title">01 | 第1节：初识编码</span> <span class="free">免费</span></li>-->
<!--              <li><span class="lesson-title">01 | 第1节：初识编码初识编码初识编码初识编码</span> <span class="free">免费</span></li>-->
            </ul>
            <div class="pay-box">
              <span class="discount-type" v-if="course_value.discount_name">{{course_value.discount_name}}</span>
              <span class="discount-price">￥{{course_value.real_price}}元</span>
              <span class="original-price">原价：{{course_value.price}}元</span>
              <span class="buy-now">立即购买</span>
            </div>
          </div>
        </div>

      </div>


    </div>


    <Footer></Footer>
  </div>
</template>

<script>
  import Header from "./common/Header"
  import Footer from "./common/Footer"
  export default {
      name: "Nbcourse",
      data(){
        return{
          category:0,  // 默认之为0,
          category_list:[],
          course_data:[],
          filters:{}, // 用来存放查询参数的
          count:0, // 总数据量
        }
      },
      components:{
        Header,
        Footer,
      },
      created() {
        this.get_course_category_data();
        this.get_course_data();
      },


      methods:{
        pageChangeEvent(cpage){
          console.log(cpage);
          this.filters.page = cpage;  //{page:3}
          this.get_course_data();
        },
        handleSizeChange(size){
          // console.log('>>>>', size);
          this.filters.size = size;//{size:10}
          this.get_course_data();
        },


        // 添加过滤条件
        filter_courses(course_id){
          this.category=course_id;
          if (course_id === 0){
             // this.filters = {};
             delete this.filters['course_category'];  // 删除分类过滤条件

          }else {
            this.filters.course_category = this.category;  // {course_category:3}
          }
          this.get_course_data();
          // console.log(this.category);
        },

        get_course_category_data(){
          this.$axios.get(`${this.$settings.host}/course/categorys/`)
          .then((res)=>{
            this.category_list = res.data;
         })
          .catch((error)=>{
          })
        },
        get_course_data(){
          this.$axios.get(`${this.$settings.host}/course/list/`,{
            params:this.filters,  //{course_category:3,page:3}
          })
          .then((res)=>{
            this.course_data = res.data.results;
            this.count = res.data.count
         })
          .catch((error)=>{

          })
        }
      }


  }
</script>



<style scoped>
  .course{
    background: #f6f6f6;
  }
  .course .main{
    width: 1100px;
    margin: 35px auto 0;
  }
  .course .condition{
    margin-bottom: 35px;
    padding: 25px 30px 25px 20px;
    background: #fff;
    border-radius: 4px;
    box-shadow: 0 2px 4px 0 #f0f0f0;
  }
  .course .cate-list{
    border-bottom: 1px solid #333;
    border-bottom-color: rgba(51,51,51,.05);
    padding-bottom: 18px;
    margin-bottom: 17px;
  }
  .course .cate-list::after{
    content:"";
    display: block;
    clear: both;
  }
  .course .cate-list li{
    float: left;
    font-size: 16px;
    padding: 6px 15px;
    line-height: 16px;
    margin-left: 14px;
    position: relative;
    transition: all .3s ease;
    cursor: pointer;
    color: #4a4a4a;
    border: 1px solid transparent; /* transparent 透明 */
  }
  .course .cate-list .title{
    color: #888;
    margin-left: 0;
    letter-spacing: .36px;
    padding: 0;
    line-height: 28px;
  }
  .course .cate-list .this{
    color: #ffc210;
    border: 1px solid #ffc210!important;
    border-radius: 30px;
  }
  .course .ordering::after{
    content:"";
    display: block;
    clear: both;
  }
  .course .ordering ul{
    float: left;
  }
  .course .ordering ul::after{
    content:"";
    display: block;
    clear: both;
  }
  .course .ordering .condition-result{
    float: right;
    font-size: 14px;
    color: #9b9b9b;
    line-height: 28px;
  }
  .course .ordering ul li{
    float: left;
    padding: 6px 15px;
    line-height: 16px;
    margin-left: 14px;
    position: relative;
    transition: all .3s ease;
    cursor: pointer;
    color: #4a4a4a;
  }
  .course .ordering .title{
    font-size: 16px;
    color: #888;
    letter-spacing: .36px;
    margin-left: 0;
    padding:0;
    line-height: 28px;
  }
  .course .ordering .this{
    color: #ffc210;
  }
  .course .ordering .price{
    position: relative;
  }
  .course .ordering .price::before,
  .course .ordering .price::after{
    cursor: pointer;
    content:"";
    display: block;
    width: 0px;
    height: 0px;
    border: 5px solid transparent;
    position: absolute;
    right: 0;
  }
  .course .ordering .price::before{
    border-bottom: 5px solid #aaa;
    margin-bottom: 2px;
    top: 2px;
  }
  .course .ordering .price::after{
    border-top: 5px solid #aaa;
    bottom: 2px;
  }
  .course .course-item:hover{
    box-shadow: 4px 6px 16px rgba(0,0,0,.5);
  }
  .course .course-item{
    width: 1050px;
    background: #fff;
    padding: 20px 30px 20px 20px;
    margin-bottom: 35px;
    border-radius: 2px;
    cursor: pointer;
    box-shadow: 2px 3px 16px rgba(0,0,0,.1);
    /* css3.0 过渡动画 hover 事件操作 */
    transition: all .2s ease;
  }
  .course .course-item::after{
    content:"";
    display: block;
    clear: both;
  }
  /* 顶级元素 父级元素  当前元素{} */
  .course .course-item .course-image{
    float: left;
    width: 423px;
    height: 210px;
    margin-right: 30px;
  }
  .course .course-item .course-image img{
    width: 100%;
  }
  .course .course-item .course-info{
    float: left;
    width: 596px;
  }
  .course-item .course-info h3 {
    font-size: 26px;
    color: #333;
    font-weight: normal;
    margin-bottom: 8px;
  }
  .course-item .course-info h3 span{
    font-size: 14px;
    color: #9b9b9b;
    float: right;
    margin-top: 14px;
  }
  .course-item .course-info h3 span img{
      width: 11px;
      height: auto;
      margin-right: 7px;
  }
  .course-item .course-info .teather-info{
      font-size: 14px;
      color: #9b9b9b;
      margin-bottom: 14px;
      padding-bottom: 14px;
      border-bottom: 1px solid #333;
      border-bottom-color: rgba(51,51,51,.05);
  }
  .course-item .course-info .teather-info span{
      float: right;
  }
  .course-item .lesson-list::after{
      content:"";
      display: block;
      clear: both;
  }
  .course-item .lesson-list li {
    float: left;
    width: 44%;
    font-size: 14px;
    color: #666;
    padding-left: 22px;
    /* background: url("路径") 是否平铺 x轴位置 y轴位置 */
    background: url("/static/image/play-icon-gray.svg") no-repeat left 4px;
    margin-bottom: 15px;
  }
  .course-item .lesson-list li .lesson-title{
      /* 以下3句，文本内容过多，会自动隐藏，并显示省略符号 */
      text-overflow: ellipsis;
      overflow: hidden;
      white-space: nowrap;
      display:inline-block;
      max-width: 200px;
  }
  .course-item .lesson-list li:hover{
      background-image: url("/static/image/play-icon-yellow.svg");
      color: #ffc210;
  }
  .course-item .lesson-list li .free{
      width: 34px;
      height: 20px;
      color: #fd7b4d;
      vertical-align: super;
      margin-left: 10px;
      border: 1px solid #fd7b4d;
      border-radius: 2px;
      text-align: center;
      font-size: 13px;
      white-space: nowrap;
  }
  .course-item .lesson-list li:hover .free{
      color: #ffc210;
      border-color: #ffc210;
  }
  .course-item .pay-box::after{
    content:"";
    display: block;
    clear: both;
  }
  .course-item .pay-box .discount-type{
    padding: 6px 10px;
    font-size: 16px;
    color: #fff;
    text-align: center;
    margin-right: 8px;
    background: #fa6240;
    border: 1px solid #fa6240;
    border-radius: 10px 0 10px 0;
    float: left;
  }
  .course-item .pay-box .discount-price{
    font-size: 24px;
    color: #fa6240;
    float: left;
  }
  .course-item .pay-box .original-price{
    text-decoration: line-through;
    font-size: 14px;
    color: #9b9b9b;
    margin-left: 10px;
    float: left;
    margin-top: 10px;
  }
  .course-item .pay-box .buy-now{
    width: 120px;
    height: 38px;
    background: transparent;
    color: #fa6240;
    font-size: 16px;
    border: 1px solid #fd7b4d;
    border-radius: 3px;
    transition: all .2s ease-in-out;
    float: right;
    text-align: center;
    line-height: 38px;
  }
  .course-item .pay-box .buy-now:hover{
    color: #fff;
    background: #ffc210;
    border: 1px solid #ffc210;
  }
</style>
